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Article Dans Une Revue Physical Review Letters Année : 2021

Effective Toughness of Heterogeneous Materials with Rate-Dependent Fracture Energy

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Résumé

We investigate dynamic fracture of heterogeneous materials experimentally by measuring displacement fields as a rupture propagates through a periodic array of obstacles of controlled fracture energy. Our measurements demonstrate the applicability of the classical equation of motion of cracks at a discontinuity of fracture energy: the crack speed jumps at the entrance and exit of an obstacle, as predicted by the crack-tip energy balance within the brittle fracture framework. The speed jump amplitude is governed by the fracture energy contrast and by the combination of rate-dependency of fracture energy and inertia of the medium, which allows the crack to cross a fracture energy discontinuity at constant energy release rate. This discontinuous dynamics and the rate-dependence cause higher effective toughness, which governs the coarse-grained behavior of these cracks.
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Dates et versions

hal-03358024 , version 1 (29-09-2021)

Identifiants

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Gabriele Albertini, Mathias Lebihain, François Hild, Laurent Ponson, David S Kammer. Effective Toughness of Heterogeneous Materials with Rate-Dependent Fracture Energy. Physical Review Letters, 2021, 127 (3), ⟨10.1103/PhysRevLett.127.035501⟩. ⟨hal-03358024⟩
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